Mechanical Crossword!

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Across
  1. 2. Change in length per unit length
  2. 6. Ability of a material to withstand wear
  3. 7. Heat transfer without bulk motion
  4. 9. Unit of thermal energy
  5. 11. Temperature at which a liquid boils
  6. 12. Gear used for non parallel shafts
  7. 13. Device converting mechanical energy to electrical energy
  8. 14. Tool used for tightening nuts
  9. 15. Ratio of output power to input power
Down
  1. 1. Resistance to indentation
  2. 3. Machine element used to transmit torque
  3. 4. Device used to measure speed of rotation
  4. 5. Manufacturing process using molten metal
  5. 8. Engine operating on constant pressure heat addition
  6. 10. Cycle used in petrol engines